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CVE-2026-27469

Isso is a lightweight commenting server written in Python and JavaScript. In commits before 0afbfe0691ee237963e8fb0b2ee01c9e55ca2144, there is a stored Cross-Site Scripting (XSS) vulnerability affecting the website and author comment fields. The website field was HTML-escaped using quote=False, which left single and double quotes unescaped. Since the frontend inserts the website value directly into a single-quoted href attribute via string concatenation, a single quote in the URL breaks out of t
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:0581dcccb504d7fb5eb966bcad92362d49baa6d319765b195a8255a8b641cbdb
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-116","description":"CWE-116: Improper Encoding or Escaping of Output","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c5555700d8878f9e4c178ff193a9c2c9108a310b9e4474b7cc58209ec0e778b6 · sha256:5a1d8a05b3748755… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c5555700d8878f9e4c178ff193a9c2c9108a310b9e4474b7cc58209ec0e778b6 · sha256:5a1d8a05b3748755… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"isso","vendor":"isso-comments","versions":[{"status":"affected","version":"< 0afbfe0691ee237963e8fb0b2ee01c9e55ca2144"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c5555700d8878f9e4c178ff193a9c2c9108a310b9e4474b7cc58209ec0e778b6 · sha256:5a1d8a05b3748755… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c5555700d8878f9e4c178ff193a9c2c9108a310b9e4474b7cc58209ec0e778b6 · sha256:5a1d8a05b3748755… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-116","description":"CWE-116: Improper Encoding or Escaping of Output","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c5555700d8878f9e4c178ff193a9c2c9108a310b9e4474b7cc58209ec0e778b6 · sha256:5a1d8a05b3748755… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c5555700d8878f9e4c178ff193a9c2c9108a310b9e4474b7cc58209ec0e778b6 · sha256:5a1d8a05b3748755… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://docs.python.org/3/library/html.html#html.escape","tags":["x_refsource_MISC"],"url":"https://docs.python.org/3/library/html.html#html.escape"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c5555700d8878f9e4c178ff193a9c2c9108a310b9e4474b7cc58209ec0e778b6 · sha256:5a1d8a05b3748755… · /containers/cna/references/2
{"name":"https://github.com/isso-comments/isso/commit/0afbfe0691ee237963e8fb0b2ee01c9e55ca2144","tags":["x_refsource_MISC"],"url":"https://github.com/isso-comments/isso/commit/0afbfe0691ee237963e8fb0b2ee01c9e55ca2144"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c5555700d8878f9e4c178ff193a9c2c9108a310b9e4474b7cc58209ec0e778b6 · sha256:5a1d8a05b3748755… · /containers/cna/references/1
{"name":"https://github.com/isso-comments/isso/security/advisories/GHSA-9fww-8cpr-q66r","tags":["x_refsource_CONFIRM"],"url":"https://github.com/isso-comments/isso/security/advisories/GHSA-9fww-8cpr-q66r"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c5555700d8878f9e4c178ff193a9c2c9108a310b9e4474b7cc58209ec0e778b6 · sha256:5a1d8a05b3748755… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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